#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
int s[50]={31,28,31,30,31,30,31,31,30,31,30,31};
long long a,b,t,h,c,sum;
using namespace std;
long long huiwen(int a1)
{
	int k=0;
	while(a1!=0)
	{
		k=k*10+a1%10;
		a1/=10;
	}
	return k;
}
int main()
{
	//freopen("date.in","r",stdin);
	//freopen("date.out","w",stdout); 
	cin>>a>>b;
	h=a/10000000*1000+a/1000000%10*100+a/100000%10*10+a/10000%10;
	t=b/10000000*1000+b/1000000%10*100+b/100000%10*10+b/10000%10;
	for(int i=h;i<=t;i++)
	{
		for(int j=1;j<=12;j++)
		{
			for(int k=1;k<=s[j-1];k++)
			{ 
				c=i*10000+j*100+k;
				if(huiwen(c)==c) sum++;
			}
		}
	}
	cout<<sum;
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}